ADD
PHP code
<?php
/*
* Adds "value1" to "value2" and stores the result into "result".
* opcode number: 1
*/
echo 1 + 2;
?>
PHP opcodes
Function name: (null)
Compiled variables: none
| line | # | op | fetch | ext | return | operands |
|---|---|---|---|---|---|---|
| 6 | 0 | ADD | ~0 | 1,2 | ||
| 1 | ECHO | ~0 | ||||
| 7 | 2 | RETURN | 1 |
- PHP Руководство
- Функции по категориям
- Индекс функций
- Ядро PHP: Руководство хакера
- Zend Engine 2 Opcodes
- ADD
- ADD_ARRAY_ELEMENT
- ADD_CHAR
- ADD_INTERFACE
- ADD_STRING
- ADD_VAR
- ASSIGN
- ASSIGN_ADD
- ASSIGN_BW_AND
- ASSIGN_BW_OR
- ASSIGN_BW_XOR
- ASSIGN_CONCAT
- ASSIGN_DIM
- ASSIGN_DIV
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- ASSIGN_REF
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- ASSIGN_SR
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- BEGIN_SILENCE
- BOOL
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- DIV
- DO_FCALL
- DO_FCALL_BY_NAME
- ECHO
- END_SILENCE
- EXIT
- EXT_FCALL_BEGIN
- EXT_FCALL_END
- EXT_NOP
- EXT_STMT
- FE_FETCH
- FE_RESET
- FETCH_CLASS
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- FETCH_DIM_FUNC_ARG
- FETCH_DIM_IS
- FETCH_DIM_R
- FETCH_DIM_RW
- FETCH_DIM_TMP_VAR
- FETCH_DIM_UNSET
- FETCH_DIM_W
- FETCH_FUNC_ARG
- FETCH_IS
- FETCH_OBJ_FUNC_ARG
- FETCH_OBJ_IS
- FETCH_OBJ_R
- FETCH_OBJ_RW
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- FETCH_R
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- FETCH_W
- FREE
- GOTO
- HANDLE_EXCEPTION
- INCLUDE_OR_EVAL
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- INSTANCEOF
- IS_EQUAL
- IS_IDENTICAL
- IS_NOT_EQUAL
- IS_NOT_IDENTICAL
- IS_SMALLER
- IS_SMALLER_OR_EQUAL
- ISSET_ISEMPTY_DIM_OBJ
- ISSET_ISEMPTY_PROP_OBJ
- ISSET_ISEMPTY_VAR
- JMP
- JMPNZ
- JMPNZ_EX
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- MOD
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- QM_ASSIGN
- RAISE_ABSTRACT_ERROR
- RECV
- RECV_INIT
- RETURN
- RETURN_BY_REF
- SEND_REF
- SEND_VAL
- SEND_VAR
- SEND_VAR_NO_REF
- SL
- SR
- SUB
- SWITCH_FREE
- THROW
- TICKS
- UNSET_DIM
- UNSET_OBJ
- UNSET_VAR
- USER_OPCODE
- VERIFY_ABSTRACT_CLASS
- ZEND_DECLARE_LAMBDA_FUNCTION
- ZEND_JMP_SET
Коментарии
<?php
echo 1+2;
?>
qiufeng@ubuntu:~$ php -dvld.active=1 test.php
Finding entry points
Branch analysis from position: 0
Return found
filename: /home/qiufeng/test.php
function name: (null)
number of ops: 3
compiled vars: none
line # * op fetch ext return operands
---------------------------------------------------------------------------------
2 0 > ADD ~0 1, 2
1 ECHO ~0
3 2 > RETURN 1
branch: # 0; line: 2- 3; sop: 0; eop: 2
path #1: 0,
$ php -vPHP 7.1.5 (cli) (built: May 13 2017 13:30:32) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.1.5, Copyright (c) 1999-2017, by Zend Technologies
with Xdebug v2.5.4, Copyright (c) 2002-2017, by Derick Rethans
--------------------------------
$ cat test.php
<?php
echo 1 + 2;
--------------------------------
$ php -dvld.active=1 test.php
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename: /data/test.php
function name: (null)
number of ops: 3
compiled vars: none
line #* E I O op fetch ext return operands
-------------------------------------------------------------------------------------
2 0 E > EXT_STMT
1 ECHO 3
4 2 > RETURN 1
For you information
Using +0 for casting a string into a integer works but it generates a warning in php 7.1+
PHP 5.X: "abc"+0 = 0
PHP 7.0: "abc"+0 = 0
PHP 7.1: "abc"+0 = 0 (Warning: A non-numeric value encountered in..)
The correct way (if you are using it for casting) is to do
PHP 7.1: (int)"abc" = 0